Recently @henrikWhale reported that the DigitalOcean eBook: Kubernetes for Full-Stack Developers EPUB is being rejected by Google Books.
In case anyone else sees this error as well, what you could do is rather than uploading the EPUB to Google, you could add it directly to your library via this link here:
I hope that this helps!
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For more information about the Kubernetes for Full-Stack Developers eBook you can visit the book page here:
Hope that this helps!
Here’s the English version of your link: https://books.google.de/books?id=oy3RDwAAQBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
It doesn’t work for me personally (when I add it to “My Books on Google Play” and reload the page, the checkmark has simply disappeared – and the book consequently also doesn’t show up in the Play Books app), but that appears to be just some current Google Books bug.